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C. E. DAVIS MINING MACHINE Nav. 26, 1929.

Original Filed Feb. 14, 1921 ll Sheets-Sheet 1 0. E. DAVIS MINING MACHINE Original Filed Feb. 14 1921 11 Sheets-Sheet s Jill/I f y/411111111. I

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Original Filed Feb. 14, 1921 11 Sheets-Sheet 4 17226707502 C/zarZe Z: Dan/2;; 55

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MINING MACHINE Original Filed Feb. 14 I921 11 Sheets-Sheet 8 Invcnior 7'Z 5Z7 val? fliiarneygs' s wwx ww NM 26, 1929. c, E, DAVIS 1,737,045

I MINING MACHINE Original Filed Feb. 14 1921 1L Sheets-Sheet 9 mu i Znvewiol C' (Z7265 Ear/v35 C. E. DAVIS MINING MACHINE Nov; 26, 1929.

ll Sheets-Sheet 10 Original Filed Feb. 14 1921 .c'. E. DAVIS 1,737,045

MINING MACHINE Original Filed Feb. 14 1921 ll Sheets-Sheet ll fvzwenfor Patented Nov. 26, 1929 UNITED STATES PATENT OFFICE.

CHARLES E. DAVIS, OF CHICAGO, ILLINOIS, ASSIGNOR TO GOODMAN MANUFACTURING COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS MINING MACHINE Application filed February 14, 1921, Serial No. 444,767. Renewed April 20, 1929.

This invention relates to mining machines and has for its object to provide a new and improved device of this description. The invention has among other objects to provide a mining machine which can be easily and quickly handled during its operation and during its movement from place to place.

The invention has among other objects to provide a mining machine which has a main frame, preferably mounted upon wheels, and a cutting element separate from this main frame with a controlling connection between the cutting element and the main frame, this controlling connection arranged so that it can lift and lower the cutting element and so that it can move the cutting element laterally while it is cutting and the device may further be arranged so that the controlling connection while the machine is cutting does not support the machine, but only moves it laterally, the machine beinrr supported upon the floor of the mine, and being free to follow any unevenness of the floor, said machine being, during the cutting movement, independent of any vertically acting support. This controlling connection may thus be used to lift the machine and carry it to the point of use and lower it to the floor and then the lifting action may cease and the machine be supported on the floor, thus giving it great freedom of movement so that it may cut around stones and other hard obstacles instead of cutting through them and may follow the floor of the mine whatever its form, shape contour or arrangement may be.

This invention permits a mining machine separate from a mainframe or truck to be handled as though it were on the truck, and ye; makes it unnecessary to unload it from the truck when being operated or load it on the truck when being carried from point to point The invention has other objects which are more specifically pointed out in the specification and claims hereto attached.

1313 of Fig.

In the drawings I have illustrated one form Fig. 2 is a View of the front end of the mining machine removed from Fig. 1, a portion of the cutter being omitted;

Fig. 3 is a plan view of the portion of the machine illustrated in Fig. 1;

Fig. 4 is a plan view of the portion of the machine illustrated in Fig. 2;

Fig. 5 is a sectional view taken on'line 5-5 of Fig. 1;

Fig. 6 is a sectional 6-6 of Fig. 3;

Fig. 7 is a sectional view taken on line 7-7 of Figs. 3 and 5;

Fig. 8 is a. sectional view takenon line 8+8 of Figs. 3 and 5; 1 g

Fig. 9 is a sectional view taken on line 9-9 of Fig. 3; I

Fig. 10 is a sectional viewtaken 101O of Fig. 3;

Fig. 11 is a sectional view taken 1111 of Fig. 4;

Fig. 12 is a sectional view 1212 of Fig. 11;

Fig. 13 is a sectional view 11 sectional view 11; sectional view 11; sectional View 15; sectional view 14;

view taken on line on line on line taken on line taken line Fig. 14 is a taken on line 14-14 of Fig. i

Fig. 15 is a 1515 of Fig. Fig. 16 is a 16-16 of Fig. Fig. 17 is a 1717 of Fig. i

Fig. 18 is a diagrammatic view showing the machine in a central position before starting a cut;

Fig. 19 is a similar View showing the machine in position to begin the cut; 7

Fig. 20 is a View showing the machine after the sumping out has been made;

taken on line taken on line taken on line supporting frame.

"floor, and it"is 'thenm'oved parallel w Fig. 21 is a View showing the machine the lateral out has been made, with the par in position to make the final cut by moving the cutter rearwardly;

Fig. 22 shows the machine in position to start the cut when in a narrow entry;

Fig. 23 is a view showing the method of using the machine as a longwali machine.

Like numerals refer to like parts throughout the several figures.

In carrying out :my invention it arc-vice a machinehavin'ga frame 1., mounted. wheels 2. The frame 1 constitutes a A movable frame 3 1s movably mounted in position. As shown in Fig. 7 the movable frame 3 is provided with a hub 4 which fits on a projection 5 Ion the frame 1, the moving frame rotating about this projection. Mounted on the frame 3 are two supporting arms 6, said supporting arms 'be'ingmovab'ly mounted, and being connected with abutting element .7, arranged so thatthis cutting element may be moved to various positions. The supporting arms be arranged in any desired manner, and hereinx'shown (see Figs. '2, 4L and 15), these supporting arms are connected to the ends of a rod .or shaft 8, which is arranged so that it"may be turned for adjustment. The ends of the supporting arms 6 are shown split and'theysurround the ends 9 of the rod or shaft 8. These ends '9 are eccentric with the body portion 10 of said rod or shaft, sail body portion 10 working in a bearing 11' "1voted"tothe'fra'me of thecutting element ybeing mounted on the pivot 12 (see F T6) so that therod or shaft and its be r g may be adjusted. The cutting element is 'provided'with a cutter arm '13, and this eccentric construction of the rod or shaft, 8 "is for the purpose of adjusting this 1 arm by raising or lowering its outer so that its longitudinal axes is paralled with the floor when the cutting element is lifted lowered by the arms '6. hen for example the arms 6 are lifted or lowered this move-- ment tends to move the cutter arm'so that it will not be longitudinally parallel wi hthe -.the floor by rotating the shaft'or rod 8, these centricit'y of the main-body lOand the ends 9 .being such as to secure this-result.

If for any reason the "cutterjarm has one e o higher than the other, that is is not parallel laterally with the *floonthis parallelism is secured by moving the shaft 8and bearing afboutthe pivot 12; This is done by means of the adjusting screws 14 which re threadedinto the projections 16 *on the frame of the cutting element, and which engage the bearing 11 of the rod or shaft 8 (seeFig. 16}. It will thusbe'seen' that'by this means the cutter anmmay be adjusted so that it will be longitudinally and laterally parallel with floor along which the cut is made.

- )porting arms (3 as herein shown are l with a rock shaft 16 (see Figs. 1, This rock shaft is mounted in bearings on the movable frame 3, these bsa ings being preferably carried by the up Q r i 18 so to permit the driving scale for the cutting element to pass under the rock shaft 16. This rock shaft 16 is rocked so as to lift and lower the arms 6 in any desired manner. As herein shown a controlling arm 19 connected with the rock shaft 16 (see Fig. 3), and this controli is manipulated by suitable mechamsm to raise and lower the supporting arms and the cutting element. One form of mechanism for this purpose is herein illustrated. in this construction (see Figs. 3 and 6), the

arm 19 is provided with a socket or hub 20 at one end which surround-s a rotating part 21, which in this instance 1s screw threaded. A nut 22 ismounted on the threaded rod 21 so to be raised and lowered when the rod is rotated. Th s nut 18 prevented from rota by some suitable means, such for example as pro ections 23, which slide e stationary guide 24. It will thus that when the threaded rod is roone direction, the nut 22 is raised weight of the cutting element will lVhen the threaded s ro in the opposite direction the nut 22 will be lowered and this will press down the end of the controlling arm 19 and reel; the shaft 16 and lift the cutting element. The thread d rod 21 is rotated in any suitable manner. As herein shown it is mounted based in b 25 in the moving frame, and is ,dr ehby the motor 26 mounted on said movother member 39 of this slip clutch is connected to a shaft 40. The two members of the slip clutch are pressed together by the springs en, this connection being arranged so that when too .t strain occurs at any point, the ci- 1 lip and prevent breakage.

is provided with a pinion d1 which rotates on said rich has a clutch member 42. A is also rotatably mounted on and has clutch member id. A clutch member 425 is keyed to the 40 and adapted to engage either the 1 member 4-2, or the clutch member 4 engages a gear 4-6 on a shaft 6), which shaft is rotated in ction when the clutch member engages the clutch member 44. The pinion 41 engages an idle pinion 48 (see Figs. 3 and 8), and this idle pinion engages a gear 49 on the shaft 47 so that when the clutch member is in engagement with the clutch member 42, the shaft 47 will be rotated in the opposite direction. The shaft 47 is provided with a sliding clutch member 50 (see Fig. 6) which is adapted to engage a clutch mem- 1 her 51 on the beveled gear 52, loosely mounted on the shaft. -When these clutch members are in engagement, the beveled gear 52 is rotated, and this rotates the beveled gear 53 on the shaft 54 and the gear 55 connected with said shaft, said latter gear engaging a gear 56 on the screw threaded shaft or rod 21 so as to rotate it. It will thus be seen that by means of the clutch member 45 and the clutch member 50, the screw threaded rod or shaft 21 may be rotated forward or backward so as to lift or lower the nut 22, and thus lift or lower the cutting element 8.

The cutting element may be'lifted when it is desired to .move it from place to place and may be lowered to the floor when it is desired to make a cut.

The cutter arm of the cutting element is moved laterally by the following mechanism: The main frame 1 is provided at the rear thereof with a rack 57 (see Figs. 5 and 7). This rack is engaged by a pinion 58, loosely mounted on the shaft 59. This pinion is driven from the motor. In the construction shown the pinion 58 is provided with a clutch member 60. A sliding clutch member 61 is feathered to the hub 62 of the gear 63. The gear 63 engages a pinion 64 on a short shaft 65, and a gear 66 on this short shaft engages a pinion 67 on the shaft 47. When the shaft 47 therefore is driven as hereinbefore set out, and the clutch member 45 is in engagement with the clutch member 42, the gear 63 and the clutch member 61 will be driven in one direction, and if this clutch member 61 is brought into engagement with the clutch member 60, the pinion 58 will be rotated in one direction and will move along the rack 57, so as to rotate the moving frame about the parts 5 and 6 to move the cutting element laterally. When it is desired to move the cutting element in the opposite direction laterally, the clutch member 45 is disconnected from the clutch member 42 and connected with the member 44. This reverses the direction of the movement of the shaft 47 and reverses the pinion 58, and causes the cutting element to be moved laterally in the opposite direction.

When it is desired to move the entire device backward or forward at slow speed, the clutch member 68 (see Fig. 5) which is feathered to the shaft 59, is moved to engage the clutch member 69 connected with the gear 70, said gear being loosely mounted on the shaft 59. A pinion 71. which is connected with the hub 62, engages a gear 72 on a short shaft. This shaft has a pinion 73 also connected with it, and this pinion engages the gear 70. When the clutch member 68 is connected with the clutch member 69 it will be seen that the shaft 59 is driven at a reduced speed from the gear 63 which is connected with the motor as hereinbefore set out. The shaft 59 is provided with a beveled pinion 74 (see Figs. 5 and 7) which beveled pinion engages a beveled pinion 75 on the shaft 76. A beveled pinion 77 is connected with the shaft 7 Sand engages the beveled pinion 75 so that the shaft 78 is rotated when the shaft 59 is rotated; The shaft 78 (see Fig. 5) has a beveled pinion 79 which engages a beveled pinion 80 on the axle 81, carrying the forward wheels 2.- It will thus be seen that when the shaft 78 is rotated in one direction the entire device will be moved forward, and when the shaft 78 is rotated in the opposite direction, the entire device will be moved backward. The forward and backward movement of the shaft 78 is controlled by the clutch member 45 as hereinbefore described in connection with the driving of the pinion 58.

If it is desired to drive the entire machine at a high rate of speed, the clutch member 68 is moved out of engagement with the clutch member 69 and the clutch member 82 (see Figs. 1 and 3) feathered on the shaft 31, is moved into engagement with the clutch member 83 connected with the beveled gear 84. This connects the beveled gear 84 with the shaft 31 which is driven directly from the motor by the pinion 29 and the gear 30 keyed to the shaft 31. The beveled pinion 84 engages a beveled gear 85 on the shaft 76, and thus drives said shaft and the pinion75, and the pinion 77, and the shaft 78, and the pinions 79 and 80 at a high rate of speed.

The cutter of the cutting element may be of any suitable form and is hereby shown as a cutting chain 86 (see Fig. 14). This cutter, whatever its form, is driven in the following manner: The motor 26 drives the pinion 29 and the gear 30 and the shaft 31. A shaft 87 is provided with a clutch member 88 keyed thereto. When the clutch member 82 is moved to engage the clutchmember 88. the shaft 31 is'connected with the shaft 87 so as to rotate it. The shaft 87 is provided with a flexible or universal joint 89. The end of this shaft 87 is hollow and a shaft section 90 slides therein and is feathered thereto so as to rotate therewith, but is free to slide therealong. to compensate for variations in length due to the movement of the cutting element. The shaft section 90 is connected by a universal joint 91 with the shaft 92 (see Fig. 11) which carries a pinion 93, which engages a beveled gear 94 on the shaft 95. The latter shaft carries the sprocket wheel 96which drives the cutter chain 86.

The cutter is fed to the coal'by means of a ran cable 97' on radrum 98 (see Figs. 2: and 11 and 14) Thiscablerisfastenedto a suitablejack or other fixedsupportas shown: in Figs. 19 to.23,- inclusive,.and then the drum -is rotated to wind the cable thereon. Thisdrum isrotate'dby the following mechanism: .The motor 26Ithrough the-gears andpinions. 29, 30,32,331, .and' gear: 36' drives the member 38 of the frictionv clutch. andthe-sha-ft 99 through the. planetary gear 109 of any ordinary ZEOI'III',!21.I1(1 thus giving, a proper reduction of speed. A- gear 101' on; shaft 99 engages 1agear.:102,1-i rotating loosely 1 on. .the shaft 105, having a;cl-utch member 103.- A clutch -member2 110.4 feathered to the shaft 105," is adapted to .be -moved toxbe brought into engagement-with the clutchfmember 103 sozas to drivesa-idshaft 105. This shaft is connected bya universal joint. 106: with a shaft section-107i .Theshaft'seetion-lOT (see Fig. 11) is feathered to a hollow shaft section 108,-iand-this hollow shaft; section-is connected bya universalt joint 1.09 withtheshaft 110, carryingthe beveledpinion 11.1, which beveled pinion meshes with the beveled gear 112 rotatably mounted on the section! 113 of the frameof the cuttingelement. The-beveled-gear 112 engagesa-beveled-gear-114 connected with? the shaft 115,?said. shaft. being mounted in a' section. 116. of the; flannel-of. the cuttingelement,'saidsectionz-llfi havinga. pin 117 whic'hirfits-irito. aframepiecexlIS. The shaft;'hasa pinion r1159 see Fig.1;13 which engages" an internal gear; 120" connected .with the drum97, said drum rotating. about the frame: section:11.'-6.: It Willtlius be seenw that when the drum. 116 is rotated, ithe-cable will be wound tliereoniand themac'hine'fed to the coal. The internal- .geararrangement also reduces the speed. of the feed; and the-parts are arranged "so; astosecurethe: proper speed offeedofthe'cutter to :"tlie: materialto be cutsv i The cable" 97" (see Figs- 12 and; 14), passes over a guide ".-pulley=;121 and then passes around a secondtguid orwlirection changing pulleyx122'..i This latterpulley is mounted in a frame 123; whichrisipivcted atfitsnend by'means Ofthe-piVots 124- and 125 with the frame of the cuttingzxelementa This arrangement permits the? cable :-.to X work. freely when-leading ofiin any directiontfromwthe machine.

The device is preferably arranged so that "the cutter arm may'project-forward or may bemoved aroundito either sides. This. result is secured in the following manner'zrThe part 126-(see Figs. 21 and F14) front which the cutter arm projects, and i which carries the drunr 98, is provided with a series of holes 127 A frame piece 128, located above the 'part 12 6,'is free to move WltlliIGlfi-tlOIl thereto, and projecting throughit is a. locking device 129. This locking device passes into 'one of the holes 127 'dependingup'onthe; po-

mam/1a sition of the parts. It will thus be seen that this 'lockingdevice may be removed and the cutter arm. movedv around it any desired angle at either side of the straight forward p.osition,and then locked in this position by placing the locking device 129 in one of the holes, 127. The parts are arranged so that the cutting element can be moved through an arc ofv 180 degrees. The frame piece 128-is .cut'outfor this purpose as shown in M;

Fig. 14, and has the laterally projecting parts 130.

, Vhen the machine is being used as shown for example in Figs. 18 to 21, the cable 9? is fastened to a fixed device 131 as shown in Fig.19, the cutter arm'being shown in the position indicated. The drum is then rotated to wind the cable thereon, and this fits the. cutter tov the coal as shown in Fig. 20. The jack or fixed device 131 isthen moved to the positionshown in Fig. 20, and the cable wound upon the drum, and this fits the cutter to the coal until it reaches the position shown in Fig. 21. The jack or fixed device 131 is then moved to the position shownin Fig. 21 and the drum rotated to move the machinebaclrto finish the cut.

g It will-be noted thatwhen the body of the machine is at the beginning of its cut as shownin Fig.-;20,. the cutter arm projects to oneside at an angle. to the body of the machine and that when'it reaches the end of its lateral cut as shown in Fig. 21, it projects toward the other side or at an angle in the opposite direction'as shown in said Fig. 21, and this gradualmovement of the cutter arm during the cut must be brought about by some suitable mechanism. As herein shown this result is secured-by means of the arms 132 and 133. These arms are connected to the projections of the piece 128 by means of a universal or flexible or ball and socket joint, as shownin Fig. 17. In this construction eacharm hasv a cap 13d which engages a ball 135, the cap being adjustably connected with the arm in any desired manner as by being connected with the screw threaded part 136. This permits the easy removal of the socketfrom the ball. The arms 132 and 133 are arranged insections, pivotally connected together at 139 so that the sections have relatively-vertical movement, but not lateral movement. The ends of the arms are pivoted at. 137 and 138 to the main stationary frame 1 of the machine. It will be noted 3.2.

that these arins 132 and 133 are closer to gether at their inner ends than they are at their outer ends. The arms are therefore not parallel, but are-diverging from their inner ends toward their outer ends, and .hence when the machine is moved laterally sary to bring them into these difi'erentpositions.

In some places there are hard spots in the coal and it is necessary to cut above the floor of the mine. In such event the cutter arm can be held in any desired position by tight,

It will be noted that the supporting arms 6 are pivoted on the frame as they are connected to the rock shaft 16. The controlling arm 19 which is connected with the rock shaft 16 and hence with the arms 6 (see Figs. 3 and 6) is controlled by the nut 22. W hen the nut is screwed down, this arm is moved down and rocks the rock shaft 16 to lift the arms 6 and the cutting element. When the machine is cutting coal this nut 22 may be loosened up a sufficient amount so as to leave a space between it and the socket or hub 20 of the controlling arm 19. It will thus be seen that when the cutting element comes to a high point in the floor, it can slide up over it, and during this action the hub or socket 20 of the controlling arm 19 simply moves up and down in the space left between it andthe nut 22. It will be noted that in this device the supporting arms 6 project at an angle and the narrow entry as it permits it to be set down between the track and wall when the space is narrow as shown for example 111 Fig. 22. The

v machine can be placed in the position shown in this figure and then movedforward into the coal and then moved across the end of the track to make the complete out. It will further be noted that in this construction the mechanism is supported upon the movable frame 3 which is pivotally mounted upon the main supporting frame. It will further be noted that the motor and gears 131'016Ctout on one side of this pivot and the cutting element on the other side, the one thus counterbalancing the other as the cutting element swings from one position toanother. It will further be noted that the gearing for the operation of the different parts of the cutting element is a straight line gearing running out straight from the motor to the part to be driven. In this construction also all driving connections for slow motions go through the friction clutch which acts as a safety device. It will further be noted that there are certain characteristics in this device that permit it to make ample as shownin Fig. 22. Since the cutter arm by its method of support is in a straighter position than the arms which support it when it is at one side as shown in Fig. 22 it will thus be seen that the cutting element can be set down between the wall and the track so that the bottom of the cutting element will be below the upper part of the rails. The entire machine can then be moved forward by the cable 97 to make the initial cut, and this initial cut moves the cutting element beyond the ends of the rails, and the cutting element can then bemoved across in front of the rails, and then the entire machine can be moved back, the cutting element passing betweenthe wall of the entry andthe rails on the opposite side. In other words in this construction the bottom of the cutting element can be moved below the top of the rails while a part of the cutting element is opposite the rails, and the entire machine can then be moved forward on the rails until the sumping cut is made, and then the cuttingv element can be moved sidewise in front of the rails with its bottom portion still below the top of the rails. It can then while in this position, be moved back so part is opposite the rails to finish the final cut the final out being the portion which is shown uncut in Fig. 21.

1 claim:

1. A mining machine comprising ;a supporting frame, a cutting element movable on the mine floor independently of said sup porting frame, and three different forms of connect-ion between said cutting element and the supporting frame one being a supporting connection permitting pivotal movement of said cutting element, one beingv a drivingconnection, and one being a controlling connection for controlling the angular position of the cutting element relative to the supportlng connection.

2. A mining machine comprising a supporting frame a cutting element slidably sup portable on the mine'fioor independently of said frame two arms connected with said cutting element, a rock shaft on said supporting frame with which said arms are connected, means for rocking said shaft to lift and lower the cutting element and feeding mech in g frame intermediate their ends, and a connection between said arms and said cutting element, a motor on said supporting frame, and driving connection between said motor and said cutting element.

4. A mining machine comprising a base, a supporting frame pivotally mounted on said tween said motor and said cutter adapted to base to swing in a horizontal plane, two arms located in substantially the same horizontal plane pivota-llyconnectedto said base at separate points and projecting beyond said base 1- and supporting frame,-a shaftcarried by said frame having a pivotal connection intermediatesa-id arms, the arms and shaft adapted to be moved about their pivotal points, a cutting and feeding element connected with said arms and provided with a cutting device and a feeding device for feeding the same, and an operative connection between said shaft and said cutting device during all-of the various positions of said arms.

'5. A mining machine comprising a main frame, a motor on said frame, acutt-ing and feeding elementmovably supported on the ground independent of said frame and in a different vertical plane therefrom, said cutting and feeding element provided with a movable cutter for cutting the material, a supporting connection between said frame and said cutting and feeding element, a separate controlling connection between said cut: ting and feeding elemenitand said main frame for controlling the position of the cutting and feeding element relative to said supporting element, and a driving connection bedrive the cutter in the various positions of thecutting and feeding element.

6. A mining machine comprising a base, a frame movable angularly' on said base, supporting arms connected with said frame and projecting therefrom, a cutting element movably supportable on the ground and with which said arms are connected for pivotal movement transversely thereof, a cutter arm forming a part of said cutting element, said cutter armduring the major part of its cutting movement pro ecting at an angle with relation to the surface on which the machine re's'ts different from the angle of said supportingarms.

A mining machinecomprising a base, a rocking frame'havin'g angular movement on sai'd 'ba'se, means formoving said frame relative'to said base, arms connected with said .movable frame and projecting therefrom, a

' cutting element pivotallyconnected with said arms for movement transversely thereof, a motor on saidmovmg frame, operative connectlons between said motor and said cutting element, said motor acting as a counter Ntuatin'g mechanism for-said arms and cutting element, said actuating mechanism arranged to act as counterbalance for the arms and cutting element as the moving frame is moved angularly on said base.

9. A mining machine comprising .a base, a supporting frame pivotally mounted on said base to swing in a horizontal plane, a cutting element, a plurality of arms connected with said supporting frame so as to be free to move in a substantially vertical plane, a connec tion between said arms and saidoutting element, a motor on said supporting frame, an operative connection between said motor and said arms so that they may be moved about their pivotal connection, and a feeding mechanism separate from said arms for feeding the cutter of the cutting element to the ma terial to be out.

10, A mining machine comprising a supporting frame, acuttingelement, a plurality of arms connected With said supporting frame and pivotedon a transverse axis so as to be free to move in asubstantially vertical plane, a connection "between said arms and said cutting element, a controlling device for said'arms, a threaded part adapted tc-engage said controlling device and move it when actuated, and means for actuating *said threaded device.

'11. A mining machine comprising a sup porting frame, a cutting 'elem'ent, arplura lity of arms connected with said supporting frame so as to be free to move in a substantially vertical plane, a connection between said arms and said cutting element, a controlling devi'c'e'for said.arms, athreaded part adapted to engage said controlling device and move it when'actuated,means foractuat ing said threaded device, said threaded device adapted to be moved "out of th'e'way of said controlling device when the cutter is in operation so as to leave the cutting element free to move to accommodate itself "to unevenness in the floor.

12. A mining machine comprising a supporting device, support-ing arms connected therewith, a cutting element, a rotating ,par't eccentrically mounted on said cutting element, and a connectionbetween said rotating part and said arms by'means of which the cutting element is supported, said rotatable part adapted to be moved to adjust 'the :cutting element with relation tofhe'said arms.

13. A mining machine comprising a supporting device, supporting arms connected therewith, a cutting element, ai'rota'ting ,part eccentrically mounted on said cutting element, and a connection between said rotating part and-said *armsby means of which the cutting element is supported, said rotatable part adapted to be rotated and also adapted to be rocked 'so as tosadjust :the cutting element*withrelationtosaidarms.

14. A miningimachine fcompnisingn truck, a cutting e'lement "separate from. the truck, 5

arms connected with the truck and with the cutting element for moving the cutting element, a motor on the truck, two driving con nections between said motor and said truck, comprising four shafts, two of said shafts having their ends adjacent beveled gears on such adjacent ends, a shaft at an angle to the two shafts having a beveled gear which engages the beveled gears on said shafts, said angular shaft provided with a second beveled gear, a fourth shaft also provided with a beveled gear engaging the beveled gear on the angular shaft, and means for connecting and disconnecting the beveled gear on the fourth shaft with its shaft.

15. A mining machine comprising a supporting frame, a cutting element in front of said frame and supportable on the mine floor independently thereof, arms connecting said cutting element with said supporting frame, said arms free to move in a substantially vertical plane, a motor on said frame, a connection between said motor and said arms for moving the arms to lift the cutting element, and means for permitting the cutting element freely to move vertically when the cutting device is in operation. so that it automatically adjusts itself to the unevenness in the floor.

16. A mining machine comprising a truck adapted for movement on rails, the rails extending in proximity to the wall of material to be cut, a cutting element having a bottom support, movable arms connecting the cutting element with the truck, means for lowering the cutting element at one side of and below the top of the tracks so that its bottom will be supported on the mine floor independently of said truck, means for then moving the cutting element forward to make the sumping cut and for moving it laterally to make the cross cut, and means for moving the cutting element back at one side of the rails with its bottom portion still supported on the ground below the top of the rails to finish the cut, whereby a narrow entry may be cut.

17. A mining machine comprising a truck adapted for movement upon rails, a cutting element normally supported by said truck and provided with a shoe, means for lowering the cutting element at one side of the rails so that its cutting portion will be below the top of the rails, and with its shoe in supporting relation with the ground, means for moving the entire machine forward to make the sumping cut, and means for moving the cutting element across in front of the rails to make the lateral cut, whereby a. narrow entry may be out.

18. A mining machine comprising a base, a supporting frame pivotally mounted there on to sving in a horizontal plane, lifting means carried by said supporting frame and projecting therebeyond, a cutting element mounted on the forward end of said lifting means, a pair ofarms pivotally connected be tween said cutting element and said base for controlling the relative angular position of the twolast named elements, a motor on said supporting frame, and means operatively connecting said motor with said cutting element.

19. A mining machine comprising a base, a supporting frame pivotally mounted there on to swing in a horizontal plane, lifting means carried by said supporting frame and projecting therebeyond, a cutting element mounted on theforward end ofwsaidlifting means, a pair of arms pivotally connected be? tween said cutting element and said base for controlling the relative angular position of the two last named elements, a motor on said supporting frame, and means operatively connecting said motor with said cutting element, comprising a shaft substantially in the same horizontal plane as said lifting means.

20. A mining machine comprising a base, a supporting frame pivotally mounted there on to swing in a horizontal plane, a plurality of arms carried by said supporting frame and projecting therebeyond, a cutting element mounted on the forward end of said arms, a pair of arms pivotally connected with said cutting element and said base for controlling the relative angular position of the two last named elements, a motor on said supporting frame, and means operatively connecting said motor with said cutting element.

21. In a mining machine, the combination with a truck adapted to travel along a mine track, a cutting element supportable on the mine floor and including an elongated chain cutter frame pivotally mounted on said truck and having supporting connection with the rear end of said cutting element to raise the same or to permit the same to rest on the mine floor at the sides and end of said track and a separate connection between said truck and the rear end of said cutting element for controlling the angular position of said cutter relative to said truck.

22. In a mining machine, the combination with a truck adapted to travel along mine track, a cutting element supportable on the mine floor and including an elongated chain cutter frame pivotally mounted on said truck and having supporting connection with the rear end of said cutting element to raise the same or to permit the same to rest on the mine floor at the sides and end of said track, a separate connection between said truck and the rear end of said cutting element for controlling the angular position of said cutter relative to said truck, and means for driving said cutting mechanism while supported on the ground.

23. A mining machine comprising a base, a supporting frame pivotally mounted thereon to swing in a horizontal plane, lifting means carried by said supporting frame and projecting therebeyond, a cutting element vat;

mounifid fiii the "forward end of said lifting means, a pair of arms pivotally connected between'soid cutting element and said base for eontnoiling the :relutive :an'gular 'positioii 1 of mhe two-iast named eiements, a motor ori saidrsupporfing frame,means 'opera'tively con necting isa'id motor with said cutting e1emeat, and means for flocking the cuttin ole mom in vanigous angular positions refative a to i said icontrolling anms.

Signed at Chicago, county of Cook, and State of I Illinois, this third day of February, 1921.

E. DAVIS. 

